Bolster-spring.



H. SUNDBY.

BOLSTER SPRING.

APPLICATION FILED JUNE 2,1913

1 084 828 Patented Jan. 20, 1914.

COLUMBIA PLANOGRAPH c0. WASHINGTON c.

lone

HANS SUNDBY, OF STOUGHION, WISCONSIN.

BOLSTER-SPRING.

Specification of Letters Patent.

Application filed June 2, 1913.

Patented Jan 20, 191st.

Serial No. 771,223.

To all whom it may concern Be it known that I, HANS Sunnnv, a citizen of the United States of America, residing at Stoughton, in the county of Dane and State of Wisconsin, have invented certain new and useful Improvements in Bolster-Springs, of which the following is a specification.

This invention relates to certain new and useful improvements in bolster springs, and more particularly to that class wherein there is provided additional springs to assist the main spring to perform its functions.

An object of the invention is to provide a bolster spring provided with the usual leaf spring, which spring is pivoted at its ends to crank arms carried by shackles.

A further object of the invention is to provide a bolster spring in which a pair of coiled springs are employed whose strain is in a longitudinal direction and which are connected by supporting means to the cranks for pivotally mounting the leaf springs.

A still further object of the invention is to provide a bolster spring of improved construction which possesses particular advan tages with respect to strength and durability and which may be adjusted to control the elasticity for supporting loads of different weights, and may be mounted on a vehicle of any description.

lVith the above and other objects in view, the invention will be more fully described in detail and then claimed, reference being had to the accompanying drawing in which like numerals relate to corresponding parts throughout the several views, and wherein Figure 1 is a perspective view, partly in section of the improved bolster spring. F 2 is a side elevation, partly in section, of the device. Fig. 3 is a side elevation, partly broken away, of the device under weight, and Fig. 4: is an end elevation, partly in section, showing a shackle and cranks, and the springs pivoted thereon.

Referring more particularly to the drawing, the reference numeral. 10 indicates the usual bolster provided adjacent each end with a vertical standard 11. A bed-piece consisting of bars 12 is provided and is spaced above the bolster 10, said bars being connected at their ends by plates 13, and so positioned that the bars 12 are upon opposite sides of said bolster.

Suitable fastening means 141- are carried by the bed-piecc-bars 12 and support a pair of balancing and strengthening springs 15 and 16 intermediate their ends. The ends of the springs '15 are freely disposed, the ob' ject of which will presently appear. It will be noted that the point of connection of the springs 15 and 1.6 to the bars 12 is a rigid one and all movement of the springs with respect to the bed-piece at this point is prevented.

A pair of metal rods or bars are bent to substantially U-shape as at 17 with their ends bent outwardly in opposite directions to constitute crank arms 18, the device being termed a shackle. These shackles are mounted on the bolster 1.0 and are afforded a swinging movement at their resting point by bearing plates 19 disposed adjacent the outer ends of the bolster 10. The outer ends of the plates 19 are bifurcated to provide a pair of legs 20 which embrace both sides of the standards 11 to prevent lateral movement and displacement of the plates. The ends of the springs 16 are bent invardly in circular shape as at 21 to be received by the cranks 18 and are pivotally mounted thereon.

Pivotally mounted at their ends to the crank arms 18 are a pair of clevises 22. The ends 21. of the spring 16 are disposed on the cranks between the arms of the clevis, said elevis and spring being retained, thereon by suitable fastening means as Openings are formed in the closed ends 24: of the clevises through which freely passes a. rod 25 provided with a head upon one end and screw-threaded at its other end to receive an adjusting nut 20. Coil springs 27 are mounted on the rod 25, in one instance between the headed end of the bolt and the closed end of the clevis, and in the other instance between the closed end of the other clevis and the adjusting nut 26. The nut 26 is of such size with respect to the clcvis 22 that rotary movement thereof is prevented. The central portionof the rod is flattened on opposite sides as at 28 to constitute a wrench hold to facilitate adjustment of the bar, which adj ustmont controls the tension of the springs 27.

The operation is as follows: If the weight is evenly distributed over the bed-picce-bars 12, the device will assume the position shown by Fig. 3. In such position the bed-pieces 12 are moved nearer to the bolster 10, the

ends of the spring 16 having a tendency to move outwardly in opposite directions, and the ends of the springs 15 resting on the cranks 18 will also cushion the device. It will be noted that the cranks are directed outwardly of the bearing position of the shackles 17, thereby moving outwardly in opposite directions the clevises 22 which are cushioned by the springs 27. Thus, a double spring cushion and tension are provided. It is, of course, understood that the tension of the springs 27 can be regulated by turning the rod which movement shifts the adjusting nut 26, therefore, the tension of the device may be regulated to carry bodies of different weights.

While I have shown and described the preferred embodiment of my invention, I do not wish to confine myself thereto, as various forms and modifications may be had which will fall within the scope of the invention as claimed.

I olaim:-

The combination with a bolster, a pair of shackles mounted thereon, and bed-p-iece bars disposed above the bolsters, of leaf springs connected centrally of their ends to the said bed-piece bars and at their ends pivotally-connected to the shackles, strengthening springs carried by the bed-piece bars and disposed between the latter and the leaf springs, said strengthening springs having free ends which overlie the pivoted ends of the leaf springs, clevises pivotally-mounted on the shackles, rods having their ends extending into said olevises, and coil springs on said rods Within the 'clevises.

In testimony whereof I airix my signature in presence of two witnesses.

HANS SUNDBY.

Witnesses H. A. HUBER, MARY PHILLIPS.

(topics 01: this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

